Oil pump



Nov. 22, 1927.

K. P. NEILSEN OIL PUMP Filed Ju1y29, 1925 EN mu V: W W 0 V P. w a Ea a. 5 9.5 2 2 wLw5u zbw- L m a f 11%| HiI/ J J K f, A i r w 7 w a u .H w 2 ATTORNEY Patented Nov. 22, 1927.

1,649,971 PATENT OFFICE.

KARL P. NEILSEN, 0]! LONG BEACH, CALIFORNIA.

OIL PUMP.

Application filed July 29, 1925. Serial No. 46,858.

My invention relates generally to oil pumps and more particularly to the pump plunger and lunger valve, and their association with t e sucker rod of the pump.

In present pumps having their plunger valve located above the plunger and their sucker rod connected to the upper end of the valve cage, it has been found that sand and scale are deposited around the valve cage and not due to the fact that their external diameters are necessarlly less than that of the pump plunger, and under the action of the weight of the column of oil above the plunger and during reciprocating movement of the latter, the sand and scale are forced downwardly between the co-acting surfaces of the plunger and liners thereby scoring the surfaces and ultimately resulting in the sticking of the plunger and the sanding up of the well.

A purpose of my invention is the provision of simple and substantial means for overcoming this defect, whereby the plunger valve is arranged at the lower end of the plunger and the sucker .rod is operatively connected thereto in a manner to permit the.

unrestricted flow of oil into the interior of the plunger, the said means also eliminating the former weak oint of connection between the valve and sucker rod.

Another purpose of my invention is the provision of means for deflecting the sand and scale contained in the oil, from the wall of the liners towards the center of the plunger so that the sand and scale will be carried upwardly in the column of ascending oil and finally discharged from the pump with the oil.

I will describe only one form of oil pump embodying my invention and will then point out the novel features thereof in claims.

In the accompanying drawings Y Figure 1 is a view in vertical section showing one form of oil pump embodying my invention, and

Figure 2 is a view in elevation of the plunger valve comprised in the pump.

Referring specifically to the drawings in which similar reference characters refer to similar parts in each of the views, my invention in its present embodiment is shown applied to a conventional form of 011 pump including a barrel B having liners L within which is mounted for reciprocating movement a plunger P of tubular form. The

plunger P is internally threaded at its lower end to threadedly receive the externally threaded portion 15 of a plunger valve V so as to rigidly connect the two and support the valve in depending position upon the plunger. The valve V comprises a hollow cylindrical body 16 formed internally adjacent 1ts open lower end with an annular shoulder 17 andis internally threaded at 18 to receive the reduced threaded portion 19 of a sleeve 20 and thereby clamp a valve seat 21 between the shoulder 17 and the reduced portion 19. A ball valve 21 is adapted to rest upon said seat and is lim- 1ted 1n its upward movement by means of a bumper pin 22 extending diametrically through the body. The sleeve 20 constitutes one element of a conventional standing valve puller, the other element 23 being secured to a standing valve 24 normally seat- 1ng in a collar 25 threaded upon the lower end of the barrel B. The sleeve 20 is provided at diametrically opposed points with pms 26 proJecting into the bore of the sleeve and adapted to engage grooves 27 formed in the element 23 when it is desired 'to pull the standing valve 24 as will be understood.

To provide means for rigidly connecting a sucker rod S to the valve V the valve body 16 is formed with an extension E having an internally threaded box 28 in which the threaded pin 29 of the sucker rod is adapted to be received. The extension E extends freely into the interior of the plunger and is provided with elongated openings 30 communicating by means of a reduced chamber 31 with the valve chamber 32 of the body 16 so as to permit the unrestricted flow of oil into the interior of the plunger. It will be noted that the upper end of each of the openings 30 is beveled as indicated at 33 so as to direct the upwardly moving oil outwardly of the extension and thereby facilitate its entrance into the plunger P.

To prevent foreign particles such as sand and scale from working downwardly between the plunger and liners, and thereby scoring the two, as well as causing sticking of the plunger, the upper end of the latter is beveled as shown at 34, to provide a scraping edge adapted to scrape the sand and scale from the liners and divert it towards the center of the plunger where it will be carried upward in the column of ascending oil and ultimately discharged from the well.

From' the foregoing description it will be tively preventing sand and scale from work-,

ing downwardly between the plunger and liners. Although I have herein shown and described only one form of oil pump embodying my invention, it is to be understood that various changes and modifications may be made therein without departing from the spirit of the invention and the spirit and scope of the appended claims.

What I claim is:

1. In an oil pump, a tubular pump plunger, a plunger valve comprising a hollow body having a reduced externally threaded portion threaded into the lower end of the plunger so as to support the valve below the plunger, an extension formed upon the upper end of the body extending into the plunger and spaced from the inner wall of the latter so as to permit the tree passage of oil between the extension and plunger, said extension provided with a threaded box adapted to receive the threaded pin of a sucker rod and having relatively large openings communicating with the interior of the body and plunger so as to permit the tree passage of oil upwardly from the valve through the extension and its openings into the interior of the plunger and around the extension and sucker rod.

2. In an oil pump, a tubular open ended plunger, a plunger valve comprising a hollow body having a reduced externally threaded portion threaded into the lower end of the plunger so as to support the valve below the plunger, an extension formed integral with the body and projecting upwardly therefrom so as to be disposed within the plunger and spaced from the inner wall of the latter to permit the tree passage of oil through the plunger around the extension, the lower portion of the extension being hollow and in communication with the interior of the valve body, vertical slots in the wall of the hollow portion of the extension, the slots terminating at their upper ends in recesses having surfaces beveled upwardly and outwardly so as to deflect oil discharged through said slots towards the inner wall of the plunger, the extension having a solid upper end provided with a threaded box adapted to receive the threaded pin of a sucker rod, a valveseat in the lower end of the body, a ball valve normally gravitating into engagement with the seat, a bumper pin extending transversely through the body for limiting the upward movement of the valve off of its seat, and a standing valve pulling element secured to the lower end of the bod y KARL P. NEILSEN. 

